Shares of Acura Pharmaceuticals (Nasdaq:ACUR) have taken a tremendous swing upward. The stock is trading at $3.57 as of 2:01 p.m. ET, 20.6% above Thursday's closing price of $2.96. Volume is at 421,729, 4.4 times the daily average of 94,900.

Shares of Acura Pharmaceuticals (Nasdaq:ACUR) have taken a tremendous swing upward. The stock is trading at $3.12 as of 11:54 a.m. ET, 21.4% above Friday's closing price of $2.57. Volume is at 104,912, 0.3 times the daily average of 318,000.